Solid Carbide End Mill 6mm 6R0.5x7-21x57xD6D1 (Cutting diameter): 6mm D3 (Undercut diameter): 5. 5 mm L2 ( Length of cut): 7mm L3 (Length of undercut): 21mm L1 (Total length): 57mm D2 (Shank diameter): 6mm Z (Number of cutting edges): 4 R Corner radius: 0. 5 Helical pitch: 30 Unequal tooth pitch and variable helical pitch for smooth running Specially designed cutting edge geometry for contour machining Optimized chip chambers for safe evacuation of the chips Radius tolerance r 1. 5 mm: 0. 003